MacBook model A1466
do not support any windows again error issue
MacBook Air
Question marked as
An "A1466" MacBook Air covers a range of models, starting with the Mid-2012 thru the 2017 notebooks. Which exact MacBook Air do you have? Providing the Order # (ex. MQD32LL/A), would be helpful.
Ref: Identify your MacBook Air model - Apple Support
Also, providing more details on what exactly the issue you are having would go a long way to help us understand what you need assistance with.
Ref: Writing an effective Apple Support Communities question - Apple Support Communities